For Something New "Henna Colour" to make a change.
The innovation way.

Henna's natural color is an orange-red, which darkens to a rich red-brown due to oxidation. The color can vary depending on the type of henna used and the time it's left on the skin or hair. Black henna is not a natural color and should be avoided due to potential health risks, says the Oxfordshire County Council ​

Here's a more detailed look at henna's color:
Natural Henna is a plant called "Lawsonia Inermis"
The natural color of henna is an orange-red, which develops a richer, deeper reddish-brown shade after a few days. 
Black Henna:
Black henna is not a natural color and is typically made with a dye called PPD (para-phenylenediamine). PPD can cause serious skin reactions, so black henna should be avoided. 
Henna for Hair:
When used on hair, henna can provide shades ranging from auburn and copper red to dark brown, depending on the original hair color and the henna's intensity. it's great for covering gray hair.

Henna's color impact depends on the hair's original color. It can enhance natural red, auburn, and brown tones, but it won't lighten the hair. 

Henna is also used to condition hair, add shine, and strengthen hair fibers, according to HealthPost NZ. ​

According to a profound hair designer specialising in hair recovery, the recovery technique uses a profession device to add high-quality, special treatment and protein that closely resembles the lost nutrients in damaged hair to make your hair healthier and stronger. Above all, it has been proven that using this recovery technique to the repaired, healthier hair can in fact lead to longer-lasting and higher-maturity hairstyles. ​

How Long Does Henna Hair Dye Last?
Henna hair dye will begin to fade between 4 to 6 weeks after the initial application, however, it can stick around up to a few months. And this all depends on how long you leave the henna in when you dye it and the natural quality and type of your hair.​

​What are the disadvantages of applying henna on hair?
Everything You Need to Know Before You Dye Your Hair with Henna

some people are allergic to it.

Before using henna color, you must test it.
color may fade or become dull over time.
can only darken hair, not lighten it.
difficult to remove.
can't be bleached.
stains skin and clothes.